package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.*;
import com.sky.entity.*;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.OrderBusinessException;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.*;
import com.sky.result.PageResult;
import com.sky.service.OrderService;
import com.sky.utils.WeChatPayUtil;
import com.sky.vo.OrderPaymentVO;
import com.sky.vo.OrderStatisticsVO;
import com.sky.vo.OrderSubmitVO;
import com.sky.vo.OrderVO;
import com.sky.websocket.WebSocketServer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import static com.sky.entity.Orders.PENDING_PAYMENT;
import static com.sky.entity.Orders.UN_PAID;

@Service
@Slf4j
public class OrderServiceImpl implements OrderService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private OrderDetailMapper orderDetailMapper;
    @Autowired
    private AddressBookMapper addressBookMapper;
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private WebSocketServer webSocketServer;
    /**
     * 用户下单
     * @param ordersSubmitDTO
     * @return
     */
    @Transactional(rollbackFor = Exception.class)
    @Override
    public OrderSubmitVO submitOrder(OrdersSubmitDTO ordersSubmitDTO) {
        
        //处理用户下单可能出现的异常（购物车为空、用户的地址数据为空等）
        //地址为空
        AddressBook addressBook = addressBookMapper.getById(ordersSubmitDTO.getAddressBookId());
        if (addressBook == null){
            //抛出业务异常
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        }
        //购物车为空
        ShoppingCart shoppingCart = new ShoppingCart();
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.queryCartBydishIdOrSetmealId(shoppingCart);
        if (shoppingCartList == null || shoppingCartList.isEmpty()){
            //抛出业务异常
            throw  new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
        }


        //向订单表插入订单数据
        //封装订单对象
        Orders orders = new Orders();
        BeanUtils.copyProperties(ordersSubmitDTO,orders);
        orders.setNumber(String.valueOf(System.currentTimeMillis()));
        orders.setStatus(PENDING_PAYMENT);
        orders.setUserId(userId);
        orders.setOrderTime(LocalDateTime.now());
        orders.setPayStatus(UN_PAID);
        orders.setAddress(addressBook.getDetail());
        orders.setPhone(addressBook.getPhone());

        orders.setConsignee(addressBook.getConsignee());
        orderMapper.insertOrder(orders);


        //向订单明细表插入数据
        List<OrderDetail> orderDetailList = new ArrayList<>();
        for (ShoppingCart cart : shoppingCartList) {
            OrderDetail orderDetail = new OrderDetail();
            BeanUtils.copyProperties(cart,orderDetail);
            Long orderId = orders.getId();
            orderDetail.setOrderId(orderId);
            orderDetailList.add(orderDetail);
        }
        orderDetailMapper.insertOrderDetail(orderDetailList);
        //清空购物的数据
        shoppingCartMapper.cleanCart(userId);
        //返回订单数据
        OrderSubmitVO orderSubmitVO = OrderSubmitVO.builder().
                id(orders.getId())
                .orderAmount(orders.getAmount())
                .orderTime(orders.getOrderTime())
                .orderNumber(orders.getNumber())
                .build();
        return orderSubmitVO;
    }


    /**
     * 订单支付
     *
     * @param ordersPaymentDTO
     * @return
     */
    public OrderPaymentVO payment(OrdersPaymentDTO ordersPaymentDTO) throws Exception {

        JSONObject jsonObject = new JSONObject();
        if (jsonObject.getString("code") != null && jsonObject.getString("code").equals("ORDERPAID")) {
            throw new OrderBusinessException("该订单已支付");
        }
        OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class);
        vo.setPackageStr(jsonObject.getString("package"));


        //假装已经支付成功，直接去修改数据库
        // 根据订单号查询订单
        String orderNumber = ordersPaymentDTO.getOrderNumber();
        Orders ordersDB = orderMapper.getByNumber(orderNumber);

        // 根据订单id更新订单的状态、支付方式、支付状态、结账时间
        Orders orders = Orders.builder()
                .id(ordersDB.getId())
                .status(Orders.TO_BE_CONFIRMED)
                .payStatus(Orders.PAID)
                .checkoutTime(LocalDateTime.now())
                .build();
        orderMapper.update(orders);


        //利用webSocket向管理端推送来单提醒
        //先封装要推送的数据 与前端约定type、orderId、content
        Map map = new HashMap();
        map.put("type",1);//1表示来单提醒、2表示客户催单
        map.put("orderId",ordersDB.getId());
        map.put("content","订单号："+ordersDB.getNumber());
        //转化数据类型
        String json = JSON.toJSONString(map);
        //传递数据
        webSocketServer.sendToAllClient(json);



        //返回数据，这里直接传假数据
        return vo;
    }



    /**
     * 历史订单分页查询
     * @param page
     * @param pageSize
     * @param status
     * @return
     */
    @Override
    public PageResult pageQuery(int page, int pageSize, Integer status) {
        PageHelper.startPage(page,pageSize);
        //获取userId
        Long userId = BaseContext.getCurrentId();
        OrdersPageQueryDTO ordersPageQueryDTO = new OrdersPageQueryDTO();
        ordersPageQueryDTO.setStatus(status);
        ordersPageQueryDTO.setUserId(userId);
        Page<Orders> ordersList = (Page<Orders>) orderMapper.queryOrderByuserId(ordersPageQueryDTO);

        List<OrderVO> list = new ArrayList<>();
        //根据订单Id查询订单细节
        for (Orders orders : ordersList) {
            Long orderId = orders.getId();
            List<OrderDetail>  orderDetailList = orderDetailMapper.queryOrderDetailByorderId(orderId);
            OrderVO orderVO = new OrderVO();
            BeanUtils.copyProperties(orders,orderVO);
            orderVO.setOrderDetailList(orderDetailList);
             list.add(orderVO);
        }
        return new PageResult(ordersList.getTotal(),list);
    }


    /**
     * 客户催单
     * @param id
     */
    @Override
    public void reminder(Long id) {
        Orders orders = orderMapper.queryOrderByNumber(id);
        if (orders == null){
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }

        //封装数据
        Map map = new HashMap();
        map.put("type",2);//2表示客户催单
        map.put("orderId",orders.getId());
        map.put("content","订单号："+orders.getNumber());
        String json = JSON.toJSONString(map);
        webSocketServer.sendToAllClient(json);
    }


    /**
     * 订单详情
     * @param id
     * @return
     */
    @Override
    public OrderVO getOrderDetail(Long id) {
        //查询订单
        Orders orders = orderMapper.getOrderByOrderId(id);

        //查询订单细节
        List<OrderDetail> orderDetailList = orderDetailMapper.queryOrderDetailByorderId(id);

        //组装数据
        OrderVO orderVO = new OrderVO();
        BeanUtils.copyProperties(orders,orderVO);
        orderVO.setOrderDetailList(orderDetailList);

        return orderVO;
    }

    /**
     * 取消订单
     * @param id
     */
    @Override
    public void cancel(Long id) {
        BigDecimal amount = new BigDecimal("0.00");
        Orders orders = Orders.builder().status(Orders.CANCELLED)
                .id(id).payStatus(Orders.REFUND).amount(amount)
                .cancelReason("用户取消").cancelTime(LocalDateTime.now())
                .build();
        orderMapper.update(orders);
    }

    /**
     * 再来一单
     * @param id
     */
    @Override
    public void repetition(Long id) {
        //获取这一单的订单详情
        List<OrderDetail> orderDetailList = orderDetailMapper.queryOrderDetailByorderId(id);
              orderDetailList.forEach(orderDetail -> {
            orderDetail.setId(null);
        });

        List<ShoppingCart> shoppingCartList = new ArrayList<>();
        //将订单详情添加到购物车
        for (OrderDetail orderDetail : orderDetailList) {
            ShoppingCart shoppingCart = new ShoppingCart();
            BeanUtils.copyProperties(orderDetail,shoppingCart);
            shoppingCart.setUserId(BaseContext.getCurrentId());
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartList.add(shoppingCart);
        }

        //将购物车的数据添加到数据库
        shoppingCartMapper.insertOrderDetail(shoppingCartList);
    }




    /**
     * 订单搜索
     *
     * @param ordersPageQueryDTO
     * @return
     */
    public PageResult conditionSearch(OrdersPageQueryDTO ordersPageQueryDTO) {
        PageHelper.startPage(ordersPageQueryDTO.getPage(), ordersPageQueryDTO.getPageSize());

        Page<Orders> page = (Page<Orders>) orderMapper.queryOrderByuserId(ordersPageQueryDTO);

        // 部分订单状态，需要额外返回订单菜品信息，将Orders转化为OrderVO
        List<OrderVO> orderVOList = getOrderVOList(page);

        return new PageResult(page.getTotal(), orderVOList);
    }

    private List<OrderVO> getOrderVOList(Page<Orders> page) {
        // 需要返回订单菜品信息，自定义OrderVO响应结果
        List<OrderVO> orderVOList = new ArrayList<>();

        List<Orders> ordersList = page.getResult();
        if (!CollectionUtils.isEmpty(ordersList)) {
            for (Orders orders : ordersList) {
                // 将共同字段复制到OrderVO
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders, orderVO);
                String orderDishes = getOrderDishesStr(orders);

                // 将订单菜品信息封装到orderVO中，并添加到orderVOList
                orderVO.setOrderDishes(orderDishes);
                orderVOList.add(orderVO);
            }
        }
        return orderVOList;
    }

    /**
     * 根据订单id获取菜品信息字符串
     *
     * @param orders
     * @return
     */
    private String getOrderDishesStr(Orders orders) {
        // 查询订单菜品详情信息（订单中的菜品和数量）
        List<OrderDetail> orderDetailList = orderDetailMapper.queryOrderDetailByorderId(orders.getId());

        // 将每一条订单菜品信息拼接为字符串（格式：宫保鸡丁*3；）
        List<String> orderDishList = orderDetailList.stream().map(x -> {
            String orderDish = x.getName() + "*" + x.getNumber() + ";";
            return orderDish;
        }).collect(Collectors.toList());

        // 将该订单对应的所有菜品信息拼接在一起
        return String.join("", orderDishList);
    }


    /**
     * 各个状态的订单数量统计
     *
     * @return
     */
    public OrderStatisticsVO statistics() {
        // 根据状态，分别查询出待接单、待派送、派送中的订单数量
        Integer toBeConfirmed = orderMapper.countStatus(Orders.TO_BE_CONFIRMED);
        Integer confirmed = orderMapper.countStatus(Orders.CONFIRMED);
        Integer deliveryInProgress = orderMapper.countStatus(Orders.DELIVERY_IN_PROGRESS);

        // 将查询出的数据封装到orderStatisticsVO中响应
        OrderStatisticsVO orderStatisticsVO = new OrderStatisticsVO();
        orderStatisticsVO.setToBeConfirmed(toBeConfirmed);
        orderStatisticsVO.setConfirmed(confirmed);
        orderStatisticsVO.setDeliveryInProgress(deliveryInProgress);
        return orderStatisticsVO;
    }


    /**
     * 接单
     *
     * @param ordersConfirmDTO
     */
    public void confirm(OrdersConfirmDTO ordersConfirmDTO) {
        Orders orders = Orders.builder()
                .id(ordersConfirmDTO.getId())
                .status(Orders.CONFIRMED)
                .build();

        orderMapper.update(orders);
    }


    /**
     * 拒单
     *
     * @param ordersRejectionDTO
     */
    public void rejection(OrdersRejectionDTO ordersRejectionDTO) throws Exception {
        // 根据id查询订单
        Orders ordersDB = orderMapper.getOrderByOrderId(ordersRejectionDTO.getId());

        // 订单只有存在且状态为2（待接单）才可以拒单
        if (ordersDB == null || !ordersDB.getStatus().equals(Orders.TO_BE_CONFIRMED)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }


        // 拒单需要退款，根据订单id更新订单状态、拒单原因、取消时间
        Orders orders = new Orders();
        BigDecimal amount = new BigDecimal("0.00");
        orders.setId(ordersDB.getId());
        orders.setStatus(Orders.CANCELLED);
        orders.setRejectionReason(ordersRejectionDTO.getRejectionReason());
        orders.setCancelTime(LocalDateTime.now());
        orders.setAmount(amount);

        orderMapper.update(orders);
    }



    /**
     * 取消订单
     *
     * @param ordersCancelDTO
     */
    public void cancelByShop(OrdersCancelDTO ordersCancelDTO) throws Exception {
        // 根据id查询订单
        Orders ordersDB = orderMapper.getOrderByOrderId(ordersCancelDTO.getId());


        // 管理端取消订单需要退款，根据订单id更新订单状态、取消原因、取消时间
        Orders orders = new Orders();
        BigDecimal amount = new BigDecimal("0.00");
        orders.setId(ordersCancelDTO.getId());
        orders.setStatus(Orders.CANCELLED);
        orders.setCancelReason(ordersCancelDTO.getCancelReason());
        orders.setCancelTime(LocalDateTime.now());
        orders.setAmount(amount);
        orderMapper.update(orders);
    }


    /**
     * 派送订单
     *
     * @param id
     */
    public void delivery(Long id) {
        // 根据id查询订单
        Orders ordersDB = orderMapper.getOrderByOrderId(id);

        // 校验订单是否存在，并且状态为3
        if (ordersDB == null || !ordersDB.getStatus().equals(Orders.CONFIRMED)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = new Orders();
        orders.setId(ordersDB.getId());
        // 更新订单状态,状态转为派送中
        orders.setStatus(Orders.DELIVERY_IN_PROGRESS);

        orderMapper.update(orders);
    }



    /**
     * 完成订单
     *
     * @param id
     */
    public void complete(Long id) {
        // 根据id查询订单
        Orders ordersDB = orderMapper.getOrderByOrderId(id);

        // 校验订单是否存在，并且状态为4
        if (ordersDB == null || !ordersDB.getStatus().equals(Orders.DELIVERY_IN_PROGRESS)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = new Orders();
        orders.setId(ordersDB.getId());
        // 更新订单状态,状态转为完成
        orders.setStatus(Orders.COMPLETED);
        orders.setDeliveryTime(LocalDateTime.now());

        orderMapper.update(orders);
    }
}
